Is it possible to make a QList of tuples?

abanksdev

Something like

QList<std::tuple<int,int>> mapCoordinatesList = {(10,10), (10,30), (40,70), (120,80), (190,60), (220,30), (220,0)};

That can be accessed with

xVal = mapCoordinatesList[0][0]

Christian Ehrlicher

Why not use QVector<QPoint> instead and what does not work in your example?

J.Hilk

@Christian-Ehrlicher said in Is it possible to make a QList of tuples?:

Why not use QVector<QPoint> instead and what does not work in your example?

My guess is, the initalizer list does not auto convert to std::tuple? Because this one works

QList<std::tuple<int,int>> mapCoordinatesList = {std::tuple<int,int>(10,10), std::tuple<int,int>(10,30), std::tuple<int,int>(40,70), std::tuple<int,int>(120,80), std::tuple<int,int>(190,60), std::tuple<int,int>(220,30), std::tuple<int,int>(220,0)};

raven-worx

@abanksdev
Something like this should also work:

struct MyTuple {
   int x;
   int y;
};
QList<MyTuple> mapCoordinatesList = {
    {10,10}, {10,30}, {40,70}, {120,80}, ...
};

(untested)

Christian Ehrlicher

@J.Hilk said in Is it possible to make a QList of tuples?:

My guess is, the initalizer list does not auto convert to std::tuple?

Correct, there are also a lot of answers in the net why it does not work. :)

abanksdev

@Christian-Ehrlicher
I get the following error

/Users/banks.audrey/altitudeStatusFrame/main.cpp:6: error: no matching constructor for initialization of 'QList<std::tuple<int, int> >'
    QList<std::tuple<int,int>> mapCoordinatesList = {(10,10), (10,30), (40,70), (120,80), (190,60), (220,30), (220,0)};
                               ^                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Let me try what @J-Hilk suggested

but also QVectory<QPoint> would work, but im getting the following error:

/Users/banks.audrey/altitudeStatusFrame/main.cpp:11: error: implicit instantiation of undefined template 'QVector<QPoint>'
    QVector<QPoint> statusFrameCoordinatesList(7);
                    ^

SGaist

Hi,

Use: QList<std::tuple<int,int>> mapCoordinatesList = {{10,10}, {10,30}, {40,70}, {120,80}, {190,60}, {220,30}, {220,0}};

As for your second error, I can't reproduce it.

What compiler are you using ?

abanksdev

I used @raven-worx's method and got it working, thanks!